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Colowyo Coal Company <br />2014 Annual Reclamation and Hydrology Report <br />Lab pH <br />8.06 <br />0.25 <br />2.5 <br />8.6 <br />6.1 <br />08/19/91 <br />05/14/91 <br />Lab Cond. <br />1707.02 <br />314.39 <br />2659 <br />2820 <br />161 <br />01/19/93 <br />06/23/92 <br />TDS <br />1353.62 <br />342.73 <br />3420 <br />4050 <br />630 <br />11/08/00 <br />05/23/95 <br />Sulfate <br />649.55 <br />159.34 <br />710 <br />945 <br />235 <br />12/04/89 <br />05/20/97 <br />Calcium <br />140.72 <br />24.66 <br />198 <br />208 <br />10 <br />12/28/89 <br />3/13/84 <br />Iron <br />0.64 <br />0.90 <br />8.81 <br />8.84 <br />0.03 <br />08/13/08 <br />02/01/88 <br />Magnesium <br />144.65 <br />29.55 <br />225.3 <br />226 <br />0.7 <br />12/04/89 <br />05/20/97 <br />Sodium <br />77.11 <br />31.78 <br />195.3 <br />215 <br />19.7 <br />08/02/12 <br />04/17/00 <br />Flow rate <br />4.02 <br />5.16 <br />46.94 <br />47 <br />0.06 <br />04/27/98 <br />12/06/99 <br />Evaluation of 2014 data for LGSC <br />No results from 2014 sampling were minimum or maximum values for any parameters <br />listed above during the monitoring period. Trend line analysis determined no significant <br />correlations over time. <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.45 <br />0.12 <br />0.5 <br />8.6 <br />8.1 <br />6/18/08 <br />11/2/09 <br />Lab Cond. <br />947.11 <br />227.09 <br />1027 <br />1330 <br />303 <br />3/19/14 <br />4/15/08 <br />TDS <br />700.34 <br />140.57 <br />530 <br />910 <br />380 <br />3/19/14 <br />5/20/14 <br />Sulfate <br />221.68 <br />73.71 <br />260 <br />341 <br />81 <br />7/30/13 <br />6/03/09 <br />Calcium <br />97.69 <br />15.69 <br />59 <br />121 <br />62 <br />11/10/11 <br />5/12/08 <br />Iron <br />1.45 <br />1.97 <br />7.85 <br />7.9 <br />0.05 <br />3/17/09 <br />10/31/12 <br />Magnesium <br />76.83 <br />19.44 <br />70 <br />103 <br />33 <br />11/18/13 <br />5/20/14 <br />Sodium <br />9.93 <br />2.89 <br />13 <br />19 <br />6 <br />2/23/10 <br />6/18/08 <br />Flow rate <br />0.89 <br />1.37 <br />5.84 <br />5.86 <br />0.02 <br />5/12/08 <br />10/31/12 <br />Evaluation of 2014 data for UWFGSC <br />Maximum values for conductivity and TDS were recorded during 2014. Minimum <br />values for TDS and Magnesium were recorded during 2014. Trend line analysis <br />determined no significant correlations over time. Colowyo is unaware of any change in <br />management or additional disturbance up gradient of this location. This location is up <br />gradient of all mining activity and is not representative of potential impacts from mining. <br />LTC: <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.12 <br />0.28 <br />1.6 <br />8.6 <br />7 <br />02/25/91 <br />02/22/89 <br />Lab Cond. <br />1658.17 <br />501.77 <br />3410 <br />3610 <br />200 <br />11 /10 /11 <br />02/28/90 <br />TDS <br />1255.19 <br />479.18 <br />2766 <br />2910 <br />144 <br />11 /10 /11 <br />02/28/90 <br />Sulfate <br />587.00 <br />282.06 <br />1591 <br />1610 <br />19 <br />11 /10 /11 <br />02/28/90 <br />Calcium <br />95.09 <br />27.20 <br />133.2 <br />159 <br />25.8 <br />11 /10 /11 <br />02/05/01 <br />Iron <br />4.34 <br />17.31 <br />131.99 <br />132 <br />0.01 <br />02/28/90 <br />09/13/95 <br />Magnesium <br />120.74 <br />44.40 <br />230 <br />238 <br />8 <br />10/12/88 <br />02/28/90 <br />Page 2 -5 <br />